Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p31b0131g&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P31B-0131
Mathematics
Logic
5480 Volcanism (6063, 8148, 8450), 8414 Eruption Mechanisms And Flow Emplacement, 8425 Effusive Volcanism, 8429 Lava Rheology And Morphology
Scientific paper
Two channeled lava flows, the 1907 flow on Mauna Loa volcano, Hawai'i and a long flow near Ascraeus Mons, Mars, with dramatically different flow lengths, 23 km and 690 km respectively, exhibit similar morphologic changes in the channel-levee system from the source to the flow front. Similarities include: 1) consistent flow width and channel width in the proximal section, 2) increase in channel width in the medial section, and 3) no clear presence of a channel at the most distal end. Though the two lava flows exhibit comparable flow features, can similar emplacement events be attributed to the formation of the characteristics in the channel-levee systems regardless of an order of magnitude difference in scale? A mosaic of Ikonos satellite images (2 m/pixel) and 10 topographic profiles obtained from a Trimble R8 Differential Global Positioning System (DGPS), collected between 2004-2006, are used to map and obtain flow dimensions for the 1907 Mauna Loa flow. Thermal Emissions Imaging System (THEMIS) daytime visible images and Mars Orbiter Camera (MOC) images, and Mars Orbiter Laser Altimeter (MOLA) measurements are used for analysis of the Ascraeus Mons flow. The observed changes in morphology for both flows resemble morphologic zones (stable, transitional, dispersed flow, and flow toe) originally described for the 1984 Mauna Loa flow (Lipman and Banks, 1987). The stable zone has a well-defined channel and consistent flow width, while the channel width tends to increase in the transitional zone and characteristics of the levees also change. The zone of dispersed flow has no clearly defined channel or levees. The flow toe is defined as the active flow front. Because the two flows are emplaced, we will only consider the stable, transitional, and dispersed flow zones. By defining the morphologic zones in the final flow morphology, we are able to interpret the emplacement of the flow, including marked changes in rheology and flow rate. For each flow, we will present a map of the flow margin and channel; topographic profiles showing flow width, channel width, and flow thickness at various distances from the source, and our interpretation of the morphologic zones and emplacement.
Garry Brent W.
Zimbelman James R.
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